Dogs sometimes like to break up fights because they have a natural instinct to protect their owners and territory. When they see other animals or people approaching their owner or territory, they will try to warn or chase away these potential threats, which can lead to arguments or fights. Additionally, some dogs may be aggressive by nature or have a competitive mentality toward other dogs, which may also lead to them wanting to get involved in an argument or fight.
In general, the reasons why dogs like to break up fights may vary depending on factors such as the dog's breed, personality, experience, and social environment. It is important for owners to keep their dogs well socialized and to properly guide and control their behavior when needed to ensure they do not harm themselves or other people or animals.